the hydraulic system noise and vibration

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Inevitable due to the vibration and noise of the hydraulic system itself, but in recent years, with hydraulic technology to the development of high-speed, high pressure and high-power direction, the noise of the hydraulic system are becoming increasingly serious, and factors impede the further develop ment of hydraulic technology, sound more than 70dB has become the noise, make sounds very uncomfortable, and even people irritability, noise pollution has become increasingly attention has been paid. Research and analysis of hydraulic noise and vibration mechanism to reduce and reduce vibration and noise, and improve the performance of the hydraulic system has a positive and far-reaching significance.hydraulic couplings
Hydraulic system noise sources
In the hydraulic drive system, component or components have different levels of noise and transmission noise, Table 1 lists the ranking of hydraulic components or parts and transmission noise. A hydraulic generation and transmission direction of the noise league table components and parts name of the hydraulic pump pressure relief valve valve @ throttle valve hydraulic cylinder tank piping noise ranking 12,345,556 passed noise ranking (De partment) 23,343,212 Note: Table @ is the relief valve outside of the pressure control valve noise more than one hydraulic system, the ultimate performance out of its synthetic value, in general, the noise of the hydraulic system is nothing more than two kinds of mechanical noise and fluid noise , the following shall be analyzed and explained.
Generate mechanical noise causes and control methodshydraulic manifold block
The mechanical noise is caused due to exposure, impact and vibration between the parts. â'  rotary imbalance in the hydraulic system, electric motors, hydraulic pumps and motors, high-speed rotation, if the imbalance of the rotating parts will generate periodic unbalanced forces caused by the bending vibration of the shaft, resulting in noise vibration transmitted tank and piping, making much noise, in order to control this noise, the response to the rotor for precision balancing test, and be ca reful to avoid the resonance region. â'¡ motor noise, motor noise is mainly refers to the mechanical noise, ventilation noise and electromagnetic noise. Mechanical noise, including low frequency noise caused by the rotor imbalance, bearing noise caused by the resonance between the defects and high frequency noise caused by the installation inappropriate and motor bracket and motor. Control, bearings and the motor casing and the motor shaft with the appropriate amount of interference can not be too large or too small, the motor at both ends of the cover hole should be coaxial; good bearing lubrication. (3) coupling caused by noise coupling is the connection between the pump and motor institutions, if the motor and pump shaft so that coupling deflection, vibration and noise will be generated. Therefore, during installation, the two should be maintained at a minimum.hydraulic hose
Produce fluid causes and control of n oise
Account for a large proportion in the hydraulic system, fluid noise. This noise is due to the fluid flow rate, the sudden pressure changes and cavitation causes. â'  fluid noise of the hydraulic pump hydraulic pump fluid noise is mainly caused by the pump pressure, the periodic change of the flow and cavitation. Periodic pressure and flow changes in the hydraulic pump suction and pressure oil circulation, resulting in the formation of the pressure pulsation, causing the hydraulic vibration spread to the entire system, and the exit. Reflection of pipes and valves of the hydraulic circuit hydraulic pump pressure fluctuations in the loop, so that the pump resonance noises; the other hand, about 5% of the dissolved air in the hydraulic system (referring to the open-loop). When the pressure in the system for one reason or lower than the air separation pressure of the gas dissolved in the oil quickly a large number of isolated, the formation of bubbles, these bubbles are encountered in high pressure will be crushed to produce a strong hydraulic shocks . The former control methods, the design of gear modulus as much as possible to take a small number of teeth as much as possible to take more than the lack of the loading slot to the shape and size to be reasonable, the number of piston pump plunger should be an odd number, preferably 7 to 9 and into the oil discharge valve plate on the symmetrical triangular groove on the trapped oil to prevent piston pump. In order to prevent air mixing,
Measures to reduce the hydraulic system noise
To reduce noise, the noise source, the actual survey, measuring the sound pressure level of analysis of hydraulic systems, frequency analysis, in order to grasp the size and frequency characteristics of the noise source, and take corresponding measures, specifically enumerated as follows: (1) use of low-noise motor; and flexible coupling to reduce vibration and noise caused by the link; â'¡ in the motor , hydraulic pump and hydraulic valve installation surface should be set up anti-vibration pads; â'¢ the best use of the hydraulic manifold block instead of the channel in order to reduce vibration; â'£ reduce the vibration caused by the pressure fluctuation accumulator accumulator and rubber hoses to absorb the noise below 10 Hz, high frequency noise, the hydraulic hose is very effective; â'¤ with sound-absorbing material for sound insulation cover, the hydraulic pump cast can effectively reduce the noise; â'¥ The system should be set in the deflated device.